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110 lines
3.9 KiB
110 lines
3.9 KiB
3 months ago
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#ifndef ITEM_XMLFUNC_INCLUDED
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#define ITEM_XMLFUNC_INCLUDED
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "my_inttypes.h"
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#include "my_xml.h" // my_xml_node_type
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#include "sql/item_strfunc.h" // Item_str_func
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#include "sql/parse_tree_node_base.h"
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#include "sql_string.h"
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class Item;
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class THD;
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/* This file defines all XML functions */
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/* Structure to store a parsed XML tree */
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struct MY_XML_NODE {
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uint level; /* level in XML tree, 0 means root node */
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enum my_xml_node_type type; /* node type: node, or attribute, or text */
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uint parent; /* link to the parent */
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const char *beg; /* beginning of the name or text */
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const char *end; /* end of the name or text */
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const char *tagend; /* where this tag ends */
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};
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using ParsedXML = std::vector<MY_XML_NODE>;
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class Item_xml_str_func : public Item_str_func {
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protected:
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ParsedXML pxml;
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Item *nodeset_func;
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String xpath_tmp_value;
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public:
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Item_xml_str_func(const POS &pos, Item *a, Item *b)
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: Item_str_func(pos, a, b), nodeset_func(nullptr) {
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maybe_null = true;
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}
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Item_xml_str_func(const POS &pos, Item *a, Item *b, Item *c)
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: Item_str_func(pos, a, b, c), nodeset_func(nullptr) {
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maybe_null = true;
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}
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bool resolve_type(THD *thd) override;
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bool check_function_as_value_generator(uchar *) override { return false; }
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protected:
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/**
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Parse the specified XPATH expression and initialize @c nodeset_func.
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@note This is normally called in resolve phase since we only support
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constant XPATH expressions, but it may be called upon execution when
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const value is not yet known at resolve time.
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@param xpath_expr XPATH expression to be parsed
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@returns false on success, true on error
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*/
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bool parse_xpath(Item *xpath_expr);
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};
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class Item_func_xml_extractvalue final : public Item_xml_str_func {
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String tmp_value;
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public:
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Item_func_xml_extractvalue(const POS &pos, Item *a, Item *b)
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: Item_xml_str_func(pos, a, b) {}
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const char *func_name() const override { return "extractvalue"; }
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String *val_str(String *) override;
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};
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class Item_func_xml_update final : public Item_xml_str_func {
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String tmp_value;
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public:
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Item_func_xml_update(const POS &pos, Item *a, Item *b, Item *c)
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: Item_xml_str_func(pos, a, b, c) {}
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const char *func_name() const override { return "updatexml"; }
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String *val_str(String *) override;
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bool check_function_as_value_generator(uchar *checker_args) override {
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auto *func_arg =
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pointer_cast<Check_function_as_value_generator_parameters *>(
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checker_args);
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func_arg->banned_function_name = func_name();
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return true;
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}
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};
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#endif /* ITEM_XMLFUNC_INCLUDED */
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